"The determination that she's shown over a year ... deserves to be honored," Campbell said.

The thousands of cans of Silly String are boxed and addressed to individual servicemen and servicewomen in Iraq and will be delivered by the U.S. Postal Service once inspected.

Shriver's Silly String campaign began last year after her son, Todd, a soldier in Ramadi slated to leave Iraq next month, asked his parents to send cans of the product, which also is sold under names such as "party string" or "crazy string."

The troops were using it to detect tripwires on bombs. They can shoot the substance, which travels about 10-12 feet, across a room before entering. If it hangs in the air, that indicates a possible tripwire.